Gas burner mounting arrangement

ABSTRACT

A gas burner mounting arrangement for a burner which is subject to axial displacement relative to the gas supply manifold and the heat exchanger, in which the primary air adjusting shutter for the burner is held in a fixed position, relative to axial movement, on an orifice spud, and the upstream end plate of the burner is then locked to the air shutter by the shutter adjusting screw. The primary air shutter is held in the fixed position against axial movement by a simple friction locking clip.

United States Patent 1191 Brockhurst GAS BURNER MOUNTING ARRANGEMENT [75] Inventor: Woodrow W. Brockhurst. Parma.

Ohio

[73] Assignee: Luxaire lnc., Elyria, Ohio [22] Filed: Mar. 7, 1973 211 App]. No.: 338,717

[52] US. Cl 431/354, 48/180 C, 417/190 [51] Int. Cl F23d 13/40 Field of Search 431/354; 48/180 R, 184 R, 48/180 C; 239/556, 557, 566, 558, 559; 417/190 [56] References Cited v UNITED STATES PATENTS 10/1919 Werlih 43/181) [451 June4, 1974 3,285,317 11/1966 Hine et a1. 239/557 Primary E.\'amirm'-Carroll B. Dority, Jr.

I Attorney, Agent, or FirmE. C. Arenz [57] ABSTRACT A gas burner mounting arrangement for a burner which is subject to axial displacement relative to the gas supply manifold and the heat exchanger. in which the primary air adjusting shutter for the burner is held in a fixed position, relative to axial movement, on an orifice spud, and the upstream end plate of the burner is then locked to the air shutter by the shutter adjusting screw. The primary air shutter is held in'the fixed position against axial movement by a simple friction locking clip. 7

5 Claims, 3 Drawing Figures l GAS BURNER MOUNTING ARRANGEMENT BACKGROUND OF THE INVENTION 1. Field of the Invention The invention pertains to the art of gas burner construction and mounting arrangements.

2. Description of the Prior Art Applicant is unaware of any prior art more pertinent to the invention than the gas burner arrangement of applicants assignee prior to applicant's invention.

In that arrangement, the downstream end of the gas burner is supported by the end of the burner being received in a generally pocket-shaped structure adjacent one wall of the heat exchanger into which the gas burner projects. The upstream or, front end of the burner includes an adjustable primary air shutter into which is nested the upstream end plate of the burner provided with the primary air inlet openings, both the shutter and end plate including a central opening therein permitting the upstream end of the burner to he slipped onto that part of the orifice spud projecting away from the gas supply manifold. Thus, in that arrangement the vertical support for the gas burner is at the front and rear ends of the burner. To prevent the rear end of the burner from being elevated during shipment or handling, a burner cover plate is provided to extend down to engage the top edge of the burner to prevent the elevation of the rear end of the burner.

One difficulty occasionally experienced with the described prior art arrangement is thatthe gas burner is subject to being axially displaced in a rearward direction, that is, away from the gas supply manifold, and occasionally such displacement is sufficient that the burner tube upstream or front end becomes disengaged from the orifice spud. The possibility of this condition existing is understandable in view of conventional tolerances of those parts with which the invention concerned, and the possibility of the tolerances being additive in a direction permitting such a result. It is also noted that even should the axial displacement in a rearward direction not be sufficient to result in the disengagement of the burner tube, the typical design of the gas burners and heat exchanger is such that the best performance is achieved with the burner tube in its extreme upstream or forward position, that is, tightly against the gas supply manifold and spud projecting therefrom.

It is the aim of my invention to prevent the abovedescribed problem of axial displacement by means of a relatively inexpensive but effective arrangement.

SUMMARY OF THE INVENTION In accordance with my invention, I provide means for locking the adjustable primary air shutter in an extreme front or upstream position, without precluding its rotation for adjustment purposes, and then effecting a connection between the shutter and the upstream end plate of the burner by the locking screw carried from the end plate and engaging with the shutter. The means for retaining the air shutter in its axially fixed position on the spud may conveniently take the form of a friction locking clip which is simply slipped onto the cylindrical part of the orifice spud to hold the shutter plate tightly against the flange on the orifice spud.

DESCRIPTION OF THE DRAWING FIG. 1 is a side view of a fragmentary portion of a heat exchanger with a gas burner mounting arrangement according to the invention being provided therewith;

FIG. 2 is an exploded isometric view of the parts of the upstream or front end of the gas burner according to my invention; and v FIG. 3 is a horizontal sectional view corresponding to one taken along the line Ill-III OF FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, the heat exchanger illustrated is generally conventional and comprises a series of vertically disposed combustion flues, the lower end of each flue accommodating an elongated burner tube 12 which projects into the open front side of the combustion flue. The burner tube 12 may be of generally conventional sheet metal construction and includes a planar rear end 14 which seats in a vertically disposed pocket or slot 16 which is forwardly and upwardly open. Since the rear end 14 is a double thickness of the sheet metal in flat form, and is adapted to be vertically disposed, the pocket 16 serves to hold the rear end of the burner in its proper upright position.

The upstream or front end of the burner tube is supported from the gas supply manifold 18 which is provided with an orifice spud 20 projecting from the side of the manifold toward the heat exchanger at each location where a gas burner is to be provided. As will be explained in connection with FIGS. 2 and 3, the upstream end of the burner is adapted to be received onto and supported by the spud 20. In this position, the gas burner 12 is prevented from being elevated by a cover or hold-down plate 22 which extends down from the heat exchanger and. is provided with notches along its lower edge to receive the upper edge 24 of the gas burner.

Referring to FIG. 2, the upstream end of the burner tube 12 is provided with an end plate 26 which is fixed to the part which extends to define the throat of the burner tube, the end plate 26 being provided with a pair of oppositely disposed primary air inlet openings 28. The central part of the end plate 26 is provided with an opening 30 which freely accommodates the cylindrical end part 32 of the orifice spud 20. A small opening 34 is provided in the end plate 26 adjacent the edge of one of the air inlet openings 28 for the subsequent reception of the locking screw 36 (shown at the left-in FIG. 2) which typically is self-locking and is provided with an extended flange portion 38.

The upstream end of the burner also includes the primary air shutter generally designated 40 which is-generally similar in shape to the end plate 26, but which is slightly larger in diameter so that the end plate 26 can effectively nest within the shutter 40. The shutter 40 includes the pair of opposite air inlet openings 42 and a central hole 44 which is also adapted to be received over the cylindrical part 32 of the orifice spud 20.

The orifice spud 20 includes an outwardly extending flange 46 which separates the smooth cylindrical part 32 from the threaded part 48 which is turned onto a tapped hole in the gas supply manifold pipe 18 (FIG. I) in conventional fashion.

In accordance with the invention, and referring to FIGS. 2 and 3,.the shutter plate is locked against axial movement away from its extreme upstream or front position in which it is held against the flange 46 of the orifice spud 20. In my preferred way of accomplishing this, a friction locking clip 50 (best seen in FIG. 2) of thin spring steel is provided and is slipped onto the cylindrical part 32 of the orifice spud after the air shutter 40 has been received on the spud. As is also best shown in FIG. 2, the clip includes a hexagonally-shaped opening 52 with limited length slits 54 extending from the ends of a pair of opposite edges of the opening 52. The slits permit the edges of the opening to be deflected as the clip is being slipped onto the cylindrical part 32 of the orifice spud. In other words, the hexagonallyshaped opening is slightly smaller than an opening which would permit the clip to be slipped onto the spud and maintain the clip in a planar form. Thus, the clip bows and the edges 56 of the opening 52 accordingly bit or dig into the surface of the cylindrical part 32.

The assembly of the parts will now be described. It will be understood that the manifold 118 is fixed relative to the heat exchanger 10, these parts typically forming a part of a furnace as a whole. The orifice spud is turned into the manifold pipe 18. To install the burner assembly, the air shutter is slipped onto the orifice spud 20 and the locking clip 50 pushed on against the shutter to hold it tightly against the flange 46. The burner tube 12 is installed by inserting into its combustion flue space in the heat exchanger with the rear end 14 of the tube elevated sufficiently that it passes above the pocket 16 formed in the heat exchanger. This permits the front end of theburner to clear the end of the orifice spud, and then be received onto the orifice spud with the centered opening 30 of the end plate 26 receiving the cylindrical part 32 of the spud. After this occurs, the rear end 14 is permitted to drop into its slot or pocket 16. The locking screw 36 is then inserted through one of the openings 42 of the rotatable shutter 40 and turned into the hole 34 of the end plate 26. It will be appreciated that the extended flange 38 of the locking screw laps the outer arc-shaped edge of one'of the openings 42 of the shutter irrespective of the rotative position of the shutter relative to the screw. Inthe typically full open position of the primary air inlets of the burner, in which the openings 42 and 28 of the shutter and end plate are generally in registry, the flange 38 of the locking screw will also overlap one of the radially extending edges of the openings 42. Thus, the locking screw provides the fastening arrangement between the shutter plate and the end plate, which prevents axial movement (that is in a rearward direction) of the burner tube 12. Of course, the friction locking clip 50 holds the shutter plate tightly against the flange 46 of the spud, although this does not preclude rotating the shutter plate relative to the spud and relative to the end plate of the burner (whichin turn is held against rotation by the rear end 14 being in the vertical slot 16). After the burner has been mounted and the parts assembled as described, the cover or hold-down plate 22 (FIG. 1) is installed.

' The arrangement as described permits the ready dismantling of the burner tube from the heat exchanger, if necessary, to replace or clean an orifice spud, or for any other reason. To accomplish this, the cover plate 22 is removed, the locking screw 38 is removed, the rear end 14 of the burner is elevated to clear the pocket 4. and permit the front end of the burner to be slipped off the orifice spud and thus removed from the heat exchanger. To reassemble the parts, the reverse sequence occurs.

I claim: 1. In a gas burner and heat exchanger arrangement in which an upstream end of said burner is supported from an orifice spud projecting from a manifold, and a downstream part of said burner is supported from the heat exchanger into which said burner projects, an arrangement for holding said burner against axial displacement relative to said manifold spud, comprising:

an upstream end plate on said burner including primary air openings therein;

an air shutter plate rotatably adjustable relative to said endplate to control said primary air openings;

both said platesincluding a central opening adapted to receive said orifice spud; means mounted on said spud and interposed between said plate to hold said shutter plate in an extreme upstream position toward said manifold; and

fastening means for holding said end plate and said shutter plate against relative movement therebetweenin both a rotational and an axial direction, so that said burner is held against displacement in an axial direction.

2. An arrangement according to claim 1 wherein:

said means holding said shutter plate comprises a friction clip for urging said shutter plate in an upstream direction and resisting displacement in a downstream direction.

3. An arrangement according to claim 2 wherein:

said orifice spud includes a part thereof receiving said shutter plate and said friction clip which is smoothly cylindrical in exterior shape.

4. In a gas burner arrangement having an upstream end plate and a rotatable air shutter plate, both being adapted to be supported on a flanged orifice spud projecting from a gas supply manifold, a locking arrangement comprising:

means interposed between said end plate and said shutter plate holding said shutter plate in a position relatively closely against said spud flange while permitting rotation of said shutter plate relative to said spud, and

fastening means for holding said end plate and said shutter plate against relative movement therebetween in both a rotational and an axial direction, said fastening means being partly releasable to per mit rotation of said shutter plate relative to said end plate for adjustment of primary air, and being wholly releasable to permit the disengagement of said burner and end plate from said shutter plate.

5. An arrangement according to claim 4 wherein said interposed means comprises a friction clip adapted to be slipped onto said orifice spud and movable relatively easily in anupstream direction,

but resisting movement in a downstream direction. 

1. In a gas burner and heat exchanger arrangement in which an upstream end of said burner is supported from an orifice spud projecting from a manifold, and a downstream part of said burner is supported from the heat exchanger into which said burner projects, an arrangement for holding said burner against axial displacement relative to said manifold spud, comprising: an upstream end plate on said burner including primary air openings therein; an air shutter plate rotatably adjustable relative to said end plate to control said primary air openings; both said plates including a central opening adapted to receive said orifice spud; means mounted on said spud and interposed between said plate to hold said shutter plate in an extreme upstream position toward said manifold; and fastening means for holding said end plate aNd said shutter plate against relative movement therebetween in both a rotational and an axial direction, so that said burner is held against displacement in an axial direction.
 2. An arrangement according to claim 1 wherein: said means holding said shutter plate comprises a friction clip for urging said shutter plate in an upstream direction and resisting displacement in a downstream direction.
 3. An arrangement according to claim 2 wherein: said orifice spud includes a part thereof receiving said shutter plate and said friction clip which is smoothly cylindrical in exterior shape.
 4. In a gas burner arrangement having an upstream end plate and a rotatable air shutter plate, both being adapted to be supported on a flanged orifice spud projecting from a gas supply manifold, a locking arrangement comprising: means interposed between said end plate and said shutter plate holding said shutter plate in a position relatively closely against said spud flange while permitting rotation of said shutter plate relative to said spud, and fastening means for holding said end plate and said shutter plate against relative movement therebetween in both a rotational and an axial direction, said fastening means being partly releasable to permit rotation of said shutter plate relative to said end plate for adjustment of primary air, and being wholly releasable to permit the disengagement of said burner and end plate from said shutter plate.
 5. An arrangement according to claim 4 wherein said interposed means comprises a friction clip adapted to be slipped onto said orifice spud and movable relatively easily in an upstream direction, but resisting movement in a downstream direction. 